Texas Instruments UCC25230DRMR

Overview

UCC25230DRMR from Texas Instruments is a highly integrated PWM controller IC operating as an isolated forward-flyback (Flybuck™) converter with integrated 110-V high- and low-side MOSFETs, fixed 380-kHz switching frequency, 2% accurate 2.5-V internal reference, and 9-V VDD regulator delivering up to 2 mA - designed for high-density isolated standby bias supplies in telecom and industrial DC-DC systems.

For engineers reviewing the UCC25230DRMR datasheet, UCC25230DRMR pinout, UCC25230DRMR application, or UCC25230DRMR equivalent, key selection considerations include its input voltage range (12–100 V), cycle-by-cycle current limiting with frequency foldback, input feed-forward control (RAMP = VIN × 6%), programmable UV/OV detection via UV/OV pin, and thermally enhanced 4-mm × 4-mm SON-8/S-PVSON-N8 (DRM) package with exposed thermal pad.

Technical Context

The UCC25230DRMR implements voltage-mode control with input voltage feed-forward, enabling stable output filter design across wide input ranges. Its internal error amplifier features 2.5-V reference (±2% over temperature), 40–80 dB open-loop gain, and COMP output swing from 0.4 V to VDD–0.7 V.

It integrates dual power switches (R_DS(on) high: 6–15 Ω; R_DS(on) low: 5–10 Ω), cycle-by-cycle current limit with blanking delay (60–140 ns), and 2-ms soft-start ramp on COMP. The device remains operational during UV/OV faults and asserts VIN_G as an open-drain input-good signal.

Key Specifications

Pinout & Package

The UCC25230DRMR is housed in a thermally enhanced 4-mm × 4-mm SON-8/S-PVSON-N8 (DRM) package with exposed GND PAD (pin 9) serving as primary thermal and electrical ground. The PowerPad™ must be soldered to PCB copper for reliable thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated flyback/flybuck controller applications.

Compared with UCC28911DR and LM5020MMX/NOPB, the UCC25230DRMR uniquely combines integrated 110-V switches, Flybuck™ topology optimization, self-contained 9-V VDD, and VIN_G fault signaling - making it the only single-chip solution for <1-W isolated bias generation without optocouplers or external HV bias.

Availability

UCC25230DRMR is available at Aetrix Electronics and suitable for telecom standby bias supplies, industrial isolated auxiliary rails, server PSU housekeeping circuits, and EV charging station control bias requiring stable component supply and long-term production continuity.

Supply support for UCC25230DRMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with over 90 years of innovation in high-reliability power conversion solutions.

The UCC25230DRMR belongs to TI's Flybuck™ controller product line, engineered specifically to simplify isolated auxiliary power design by eliminating optocouplers, reducing transformer complexity, and integrating all critical functions into a thermally robust 4-mm × 4-mm package.

FAQ

What topology does the UCC25230DRMR implement, and how does it differ from standard flyback?

The UCC25230DRMR implements Texas Instruments' proprietary Flybuck™ topology - a variation of isolated forward-flyback that uses a two-winding coupled inductor instead of a three-winding transformer and omits the optocoupler. Unlike standard flyback, Flybuck™ achieves buck-derived voltage conversion (V_OUT ≈ D × V_IN × N_SEC/N_PRI) while maintaining isolation, enabling simpler compensation and smaller magnetics. This makes UCC25230DRMR ideal for low-power isolated bias where simplicity and size matter.

Can the UCC25230DRMR operate without an external bootstrap capacitor?

No - the UCC25230DRMR requires a 0.1-µF ceramic capacitor between BOOT (pin 2) and PHASE (pin 1) to generate the gate drive voltage for the high-side MOSFET. Omitting this capacitor prevents proper high-side switching and will cause immediate functional failure. The internal diode from VDD to BOOT charges this capacitor during low-side conduction; layout must minimize loop inductance for reliable operation.

What is the maximum output power achievable with the UCC25230DRMR in a Flybuck™ configuration?

Based on TI's characterization data (Figure 2), the UCC25230DRMR delivers up to 1.5 W output power with >80% efficiency at 48-V input and 9-V output. Peak output current is limited to 200 mA average, constrained by internal switch R_DS(on), thermal limits of the SON-8 package, and duty cycle (max 85%). For higher power, parallel UCC25230DRMR units or alternative controllers like UCC28911 are recommended.

How does the VIN_G pin function, and can it drive external logic directly?

VIN_G (pin 4) is an open-drain output that asserts low when input voltage falls below 1 V (UV) or rises above 5 V (OV), as set by the UV/OV pin divider. It can sink up to 10 mA with ≤100 Ω on-resistance, allowing direct connection to microcontroller GPIOs or enable inputs of downstream regulators. Pull-up to 3.3 V or 5 V is required; no internal pull-up exists. UCC25230DRMR continues normal operation regardless of VIN_G state.

Is the UCC25230DRMR pin-compatible with other devices in the UCC252xx family?

No - the UCC25230DRMR has a unique 9-pin terminal arrangement (including GND PAD) and is not pin-compatible with UCC25231 or UCC25232. While sharing Flybuck™ architecture and similar functionality, differences in protection thresholds, soft-start timing, and internal references require board-level redesign. Always verify pin mapping and thermal pad layout against DRM package drawing DRM0008A before migration.